optimum driving speed for maximum fuel economy
 

I have read some internet literature on this topic, and generally the speed is 50 mph. but i have been told other numbers such as 60-65.

What about for a honda accord, particular 2003-2007 models 4 cyl?

The car i drive is a 2006 EX-L 4 cylinder

Thanks so much

It varies by car, road, tires, tire pressure, wind conditions, humidity, altitude, and barometric pressure (or if your're a pilot you can combine the last three into the simple term "Density Altitude"). Long story short, if you want to find the optimum speed at any given moment, buy yourself a ScanGauge. :)

Those were direct sales links..Not Allowed. :(

Always go with the speed limit.. But driving 5mph less than SP can help in getting better fuel efficiency :)

okay. thanks so much!!!

Not always the case; my last car (a 2002 530i 5-Speed) got its best fuel economy at about 75 mph; definitely faster than any posted speed limit here in New England.

thats very interesting. i always drive with the windows closed on the freeway to reduce any aerodynamic friction that can decrease my fuel economy. i ideally would like to drive 75 on the freeway, but i always set it on cruise control to 65, my driving is like what many would refer to as a "grandma" lol

good for you then, my 2001 530i a/t does better mileage on 70mph. if i go higher my tank can only go for about 400-420miles rather than going 475miles :)

Good mileage for an automatic version. :)

^^^ it is mostly freeway though, like 90% of the time but when i hit the city or drive mostly city with stop and go then it is a different story. lol

my bimmer has really poor gas mileage when im in the city.. averaging only 18mpg :(

Mine was always pretty good, even in the city (for the first six months I had it I lived in the NYC metro area); I think the single worst tank still yielded something like 22 to 23 mpg. Funny thing, I picked that car up in Munich via the European Delivery program, and even with the cruise control set at ~120 mph, the OBC was still showing fuel economy in the low 20s. Not too shabby; geez I miss that car. :)